Operation Hardtack

Operation Hardtack I & II was a series of 72 nuclear tests conducted by the United States in 1958. With test moratoriums on the horizon, American weapons labs rushed out many new designs. Hardtack I was carried out in the Pacific Ocean, at Bikini Atoll, Enewetak Atoll, and Johnston Island.

Related Topics:
Nuclear tests - United States - Pacific Ocean - Bikini Atoll - Enewetak Atoll - Johnston Island

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Hardtack II was carried out later that year at the Nevada Test Site. Hardtack II consisted exclusively of low-yield atmospheric and underground tests, and 17 one-point safety tests. All Hardtack I tests were barge shots, and all Hardtack II tests were undergound, unless otherwise noted:

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Hardtack I Test Blasts

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Test Name

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Date

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Location

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Yield

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Note

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Yucca28 April, 1958Enewetak1.7 kilotonshigh-altitude balloon test

Related Topics:
Kiloton - Balloon

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Cactus5 May, 1958 Enewetak18 kilotonssurface shot

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Fir11 May, 1958 Bikini Atoll1.36 megatons93.4% fusion yield

Related Topics:
Megaton - Fusion

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Butternut11 May, 1958 Enewetak81 kilotons

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Koa12 May, 1958 Enewetak1.37 megatons

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Wahoo16 May, 1958 Enewetak9 kilotonsdeep underwater test

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Holly20 May, 1958 Enewetak5.9 kilotons

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Nutmeg21 May, 1958 Bikini Atoll25.1 kilotons

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Yellowwood26 May, 1958 Enewetak330 kilotonsexpected yield 2.5 Megatons

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Magnolia26 May, 1958 Enewetak57 kilotons

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Tobacco30 May, 1958 Enewetak11.6 kilotons2nd stage failed to ignite

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Sycamore31 May, 1958 Bikini Atoll9 kilotonsdeep underwater test

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Rose20 May, 1958 Enewetak5.9 kilotons

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Umbrella21 May, 1958 Bikini Atoll25.1 kilotons

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Maple26 May, 1958 Enewetak330 kilotonsexpected yield 2.5 Megatons

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Aspen26 May, 1958 Enewetak57 kilotonsfired in Castle Bravo crater

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Walnut14 June, 1958Enewetak1.45 kilotons

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Linden18 June, 1958 Enewetak11 kilotons

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Redwood27 June, 1958 Bikini Atoll412 kilotons

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Elder27 June, 1958 Enewetak880 kilotons

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Oak28 June, 1958 Enewetak8.9 megatons

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Hickory30 June, 1958Bikini Atoll14 kilotons

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Sequoia1 July, 1958 Enewetak5.2 kilotons

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Cedar2 July, 1958 Bikini Atoll220 kilotons

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Dogwood5 July, 1958 Enewetak397 kilotons

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Poplar12 July, 1958 Bikini Atoll9.3 megatons

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Scaevola14 July, 1958Enewetakzerosafety test

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Pisonia17 July, 1958 Enewetak255 kilotons

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Juniper22 July, 1958 Bikini Atoll65 kilotons

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Olive22 July, 1958 Enewetak202 kilotons

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Pine26 July, 1958 Bikini Atoll2 megatonsexpected yield 4-6 megatons

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Teak1 August, 1958Johnston Island3.8 megatons Redstone missile test, 252,000 foot burst height. Miscalculation resulted in detonation directly above launch site.

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Quince6 August, 1958 Enewetakzerofizzle

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Orange12 August, 1958 Johnston Island3.8 megatonsRedstone missile test, 141,000 foot burst height

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Fig18 August, 1958 Enewetak0.02 kilotons last test at Enewetak

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Hardtack II Test Blasts

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Test Name

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Date

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Location

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Yield

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Note

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Otero12 September, 1958NTS Area 3q0.038 kilotons1PT, failed

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Bernalillo17 September, 1958 NTS Area 3h0.015 kilotons1PT; unsafe

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Eddy19 September, 1958 NTS Area 7b0.083 kilotonsballon shot

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Luna21 September, 1958 NTS Area 3m0.0015 kilotons 1PT; unsafe

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Mercury23 September, 1958 NTS Area 12f"slight"1PT

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Valencia26 September, 1958 NTS Area 3r0.002 kilotons1PT

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Mars28 September, 1958 NTS Area 12f0.013 kilotons1PT

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Mora29 September, 1958 NTS Area 7b2 kilotons ballon shot; fizzled

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Hidalgo5 October, 1958 NTS Area 7b0.077 kilotonsballon test; failed

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Colfax5 October, 1958 NTS Area 3k0.0055 kilotons 1PT; failed

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Tamalpais8 October, 1958 NTS Area 12b0.072 kilotons

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Quay10 October, 1958 NTS Area 7c0.079 kilotonstower shot

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Lea13 October, 1958 NTS Area 7b1.4 kilotons ballon shot; fizzled

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Neptune14 October, 1958 NTS Area 12c0.115 kilotons 1pt; failed

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Hamilton15 October, 1958 NTS Area 50.0012 tower shot; fizzled

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Logan16 October, 1958 NTS Area 12e5 kilotons

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Dona Ana16 October, 1958NTS Area 7b0.037 kilotons

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Vesta17 October, 1958 NTS Area 9e0.024 kilotons1pt; surface shot; failed

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Rio Arriba18 October, 1958 NTS Area 3s0.090 kilotonstower shot

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San Juan20 October, 1958 NTS Area 3p"zero"1pt

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Sorocco22 October, 1958 NTS Area 3b6 kilotonsballoon shot

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Wrangell22 October, 1958NTS Area 50.115 kilotonsballoon shot; fizzle

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Oberon22 October, 1958 NTS Area 8a"zero"1pt

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Rushmore22 October, 1958 NTS Area 9a0.188 kilotons balloon test; fizzle

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Catron24 October, 1958 NTS Area 3T0.021 kilotons1pt; failed

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Juno24 October, 1958 NTS Area 9f0.0017 kilotons1pt, surface shot

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Ceres26 October, 1958NTS Area 3b0.0007 kilotons 1pt; tower shot

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Sanford26 October, 1958 NTS Area 54.9 kilotons balloon shot

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De Baca26 October, 1958 NTS Area 7b2.2 kilotons balloon shot

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Chavez27 October, 1958 NTS Area 3u0.0006 kilotons 1pt; tower shot; failed

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Evans29 October, 1958 NTS Area 12b0.055 kilotonsfizzle

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Mazama29 October, 1958NTS Area 9"zero" fizzle

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Humbodt29 October, 1958 NTS Area 3v0.0078 kilotonstower shot

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Santa Fe30 October, 1958NTS Area 7b1.3 kilotonsballoon shot

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Ganymede30 October, 1958 NTS Area 9g"zero"1pt; surface shot

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Blanca30 October, 1958 NTS Area 12e22 kilotonslargest test on Hardtack II

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Santa Fe30 October, 1958NTS Area 7b1.3 kilotonsballoon shot

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Titania30 October, 1958 NTS Area 3c0.0002 kilotons1pt; tower shot

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